Telephone.



GUSTAVUS A. JAltTICKE, OE LOUISVILLE, KENTUCKY;

TELEPHONE.

Specification of Letters Patent.

Patented June 8, 1915;

Application filed October 31, 1912. Serial No. 728,890.

vention, such as will enableothers skilled in the art to which it appertains to make and use the same. V

This invention relates to improvements in telephones and more especially to an apparatus which may be used as a repeater or a relay, which may be placed at desired points along the line' and thereby maintain the maximum strength of the currentand adapted to repeat with increased volume in either directions The primary object therefore of the invention. is in the provision of an apparatus of the character described whereby a telephone message may be transmitted from one station to another or from a plurality of stations, 1

A further object of the invention consists in constructing the apparatus in such a mannor that the sound waves produced by the electrical impulses of the diaphragm or armature of the receiver is automatically collected and distributed by the transmitter to which the local circuit is connected.

Primarily the invention consists of the combined transmitter and receiver as previously referred to which are separated by an air tight chamber the diaphragms of which are in electrical and ielding contact in a manner herein described:

With these and other objects in view, the invention consists of certain novel features of construction, and the combination and arrangement of parts as will be more fully descri ed and claimed,

The drawing is a longitudinal section of the complete invention.

In the illustrative embodiment ofthe invention 1 represents a receiver of conventional design and composed preferably of hard rubber or other insulating material and constructed to properly and detachably receive the various parts of which the inven tion is composed.

Secured in the usual manner to the rear end of the receiver 1 are two binding posts 2 to which the main line wires are in electrical contact and leading from the same and 111 electrical contact therewith are wires 3 which are connected to the electromagnets 1 all of which are secured within said receiver 1 and snugly confined therein.

The poles 5 of the electromagnet are composed of soft metal and in binding contact with a permanent magnet 6 by binding screws 7 as clearly shown, whereby said magnet and poles are in electrical and magnetic contact,

The receiver as constructed is flared outwar dly and provided with external screw threads upon which is removably secured a ring or collar 8 having corresponding screw threads and an annular flange 9 which is adapted for rigid contact with a diaphragm 10, whereby the latter is securely held in proper position in respect to the poles of the electromagnet but normally out of contact therewith. Secured to said ring or 001* lar 8 in a mechanical manner is a cover or cap 11 and confined therein is a transmitter body 12 which is provided with an annular recess 13 which receives a diaphragm 14 and disposed between said diaphragm and the plate 15 also confined in said body are carbon fillings or other insulating material 16. The diaphragms 10 and 14 within the air tight compartment 17 thus constructed are connected by a wire 18 which forms an auxiliary means for taking up the vibrations between the diaphragm which wire is flexibly connected to said diaphragms, whereby the same are adapted to vibrate independently of one another when the diaphragm 10 is attracted to and from the poles of the electroma etsr The main line wires 19 are connected to the binding posts 2 and the branch wires 20 which lead to a series of devices of the character described and in electrical contact with binding posts 21, one of said posts being in electrical contact with the plate 15 and the other attached to the diaphragm. 14, whereby the proper circuit is maintained under all conditions From the foregoing description takenv in connection with' the accompanyin drawings, the construction and operation 0 the invention will be readily understood without requirin a more extended ex lanation.

Various changes in the orm, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of this invention as defined and claimed.

Having thus described my invention, what I claim is:

In a device of the character set forth, the combination with a tubular receiver body closed at one extremity and having the other end thereof outwardly flared and externally threaded, a permanent magnet in said body, electromagnets connected to the extremities of said permanent magnet, means for connecting said electromagnets with an external circuit, a shoulder formed around the interior of said body contiguous to the flared end thereof, a diaphragm disposed upon said shoulder inoperative relation to the poles of said electromagnets, a collar having an internally threaded flange depending from its edge, said flange adapted to engage the threaded portion of said body, said collar having therein an annular opening surrounded by a depending flange adapted to project within the open end oi said receiver ody and engage said diaphragm to fixedly retain the latter; of a transmitter body having therein an annular recess, an internal shoulder formed on the transmitter body adjacent the outer end of said recess, a' cap incasing said transmitter body, said cap having an inwardly projectin flange adapted to cooperate with the shoul er on said transmitter body whereby to form an annular groove, the diaphragm having its edge disposed within said groove, a metallic plate disposed at the inner end of said recess, carbon granules interposed between said plate and diaphragm, the latter co-acting with the first-mentioned diaphragm to form an air space between said receiver and trans mitter, means to equalize the movement of the two diaphragms, and means whereby the last mentioned diaphragm and metallic plate may:l be connected to an exterior circuit.

testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

eos'rnvos A. JANICKE. Witnesses: DUDLEY T. WnLoH, Oscar B. JANIGKE. 

